{{cite journal | last1=OZBEK | first1=FETHI SABAN | year=2023 | title=CONTRIBUTION OF IMPROVING NITROGEN USE EFFICIENCY TO AGRICULTURAL ECONOMICS IN EUROPE | journal=Journal of Animal and Plant Sciences | volume=33 | issue=6 | pages=1367-1373 | doi=10.36899/JAPS.2023.6.0676 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2023-JAPS-793}}